Color correcting device

Abstract

A color correcting device effects color correction of designated color digital data (DMAIN0-DMAIN7) in consideration of two of reference color digital data (Din10-Din17, Din20-Din27). The designated color digital data is data of a designated one of three primary colors. The two of the reference color digital data are data of remaining two of the three primary colors. A first memory (43, 61-63) stores auxiliary data (DSUB0-DSUB9) of which an address is a respective combination of the two of the reference color digital data. A second memory (44, 64-66) stores corrected data (DiOUT0-DiOUT7) of the designated color, an address of the corrected data being a respective combination of the auxiliary data and the designated color digital data. A read controller (32) provides the first memory with the two of the reference color digital data, and provides the second memory with the auxiliary data read from the first memory and the designated color digital data, to read the corrected data of the designated color.

What is claimed is: 
     
       1. A color correcting device for color correction of designated color digital data in consideration of two of reference color digital data, said designated color digital data being data of one of three primary colors, said two of reference color digital data being data of the remaining two primary colors, said color correcting device comprising: a first memory for storing auxiliary data of which an address is a respective combination of said two of reference color digital data;   a second memory for storing corrected data of said designated color, an address of said corrected data being a combination of said auxiliary data and said designated color digital data; and   a read controller for providing said first memory with said two of reference color digital data, and for providing said second memory with said auxiliary data read from said first memory and said designated color digital data, to read said corrected data of said designated color.   
     
     
       2. A color correcting device as defined in claim 1, wherein said color digital data comprises first, second, and third color digital data of said three primary colors; said combination of said two of reference color digital data includes a combination of said second and third color digital data, a combination of said first and third color digital data, and a combination of said first and second color digital data;   said auxiliary data includes first, second, and third auxiliary data;   said first memory stores said first auxiliary data of which an address is said combination of said second and third color digital data, said second auxiliary data of which an address is said combination of said first and third color digital data, and said third auxiliary data of which an address is said combination of said first and second color digital data;   said corrected data of said designated color comprises first, second, and third color corrected data; and   said second memory stores said first color corrected data of which an address is a combination of said first auxiliary data and said first color digital data, said second color corrected data of which an address is a combination of said second auxiliary data and said second color digital data, and said third color corrected data of which an address is a combination of said third auxiliary data and said third color digital data.   
     
     
       3. A color correcting device as defined in claim 1, wherein said read controller includes: a device for generating a color selecting signal to select said designated color from said three primary colors; and   a selector, operable in response to said color selecting signal, for selecting said two reference color digital data from said first, second, and third color digital data and for selecting said designated color digital data from said first, second, and third color digital data differently from said two reference color digital data.   
     
     
       4. A color correcting device as defined in claim 1, wherein said color digital data includes first, second and third color digital data of said three primary colors; said combination of said two reference color digital data includes a combination of said second and third color digital data, a combination of said first and third color digital data, and a combination of said first and second color digital data;   said auxiliary data comprises first, second, and third auxiliary data;   said first memory stores said first auxiliary data of which an address is said combination of said second and third color digital data;   said corrected data of said designated color comprises first, second, and third color corrected data;   said second memory stores said second color corrected data of which an address is a combination of said first auxiliary data and said first color digital data;   said color correcting device further comprising:   a third memory for storing said second auxiliary data of which an address is said combination of said first and third color digital data;   a fourth memory for storing said second color corrected data of which an address is a combination of said second auxiliary data and said second color digital data;   a fifth memory for storing said third auxiliary data of which an address is said combination of said first and second color digital data; and   a sixth memory for storing said third color corrected data of which an address is a combination of said third auxiliary data and said third color digital data.   
     
     
       5. A color correcting device as defined in claim 1, wherein said auxiliary data is adapted to weighting said first digital data for said color correction. 
     
     
       6. A color correcting device as defined in claim 1, wherein said three primary colors are red, green and blue, and said color corrected data is one of yellow, magenta and cyan into which said red, green and blue are converted by complementary color conversion. 
     
     
       7. An apparatus for converting original color values into an output color value comprising: control means for selecting an output color and for designating one of the original color values to correspond to the selected output color;   auxiliary data storage means for storing auxiliary color correction data;   auxiliary color correction data retrieval means for retrieving auxiliary color correction data from said auxiliary data storage means based on a plurality of the original color values not designated by said control means;   output value storage means for storing output color values; and   output color retrieval means for retrieving from said output value storage means an output color value for the selected output color based on the retrieved auxiliary color correction data and the designated original color value.   
     
     
       8. The apparatus of claim 7, wherein the auxiliary color correction data retrieval means retrieves auxiliary color correction data based on two original color values not designated by said control means. 
     
     
       9. The apparatus of claim 8, wherein said control means further selects a second output color, designates a second original color value to correspond to the second selected output color, selects a third output color, and designates a third original color value to correspond to the third selected output color; said auxiliary color correction data retrieval means retrieves second auxiliary color correction data based on the two original color values not designated to correspond to the second selected output color, and retrieves third auxiliary color correction data based on the two original color values not designated to correspond to the third selected output color; and   said output color retrieval means retrieves a second output color value for the second selected output color based on the second auxiliary color correction data and the second designated original color value, and retrieves a third output color value for the third selected output color based on the third auxiliary color correction data and the third designated original color value.   
     
     
       10. The apparatus of claim 9 wherein said auxiliary data storage means includes a first memory for storing auxiliary color correction data for the first selected output color; a second memory for storing auxiliary color correction data for the second selected output color; and   a third memory for storing auxiliary color correction data for the third selected output color.   
     
     
       11. The apparatus of claim 10 wherein said output value storage means includes a fourth memory for storing output color values for the first selected output color; a fifth memory for storing output color values for the second selected output color; and   a sixth memory for storing output color values for the third selected output color.   
     
     
       12. The apparatus of claim 8, wherein said auxiliary data storage means is addressed by combining a data value representing the selected output color and the two original color values not designated to correspond to the selected output color. 
     
     
       13. The apparatus of claim 7, wherein each original color value is an 8-bit digital value. 
     
     
       14. The apparatus of claim 7, wherein each auxiliary color correction data is a 10-bit digital value. 
     
     
       15. The apparatus of claim 7, wherein said original color values respectively represent Red, Green, and Blue color levels. 
     
     
       16. The apparatus of claim 7, wherein said output color value represents one of Yellow, Cyan, and Magenta color levels. 
     
     
       17. A method for converting original color values into an output color value comprising the steps of: (a) selecting an output color;   (b) designating one of the original color values to correspond to the selected output color;   (c) retrieving auxiliary color correction data based on a plurality of original color values not designated in step (b);   (d) reading out a color value for the selected output color based on the retrieved auxiliary color correction data and the designated original color value.   
     
     
       18. The method of claim 17, further comprising the steps of: (e) selecting a second output color; and   (f) repeating steps (b)-(d) for the second selected output color.   
     
     
       19. The method of claim 18, further comprising the steps of: (g) selecting a third output color; and   (h) repeating steps (b)-(d) for the third selected output color.   
     
     
       20. The method of claim 19, wherein the auxiliary color correction data is retrieved from a different memory unit for the first, second, and third selected output colors. 
     
     
       21. The method of claim 17, wherein the auxiliary color correction data is retrieved based on two original color values not designated in step (b). 
     
     
       22. The method of claim 21, wherein the auxiliary color correction data is retrieved using an address created by combining a data value representing the selected output color and the two original color values not designated in step (b). 
     
     
       23. The method of claim 17, wherein each original color value is an 8-bit digital value. 
     
     
       24. The method of claim 17, wherein each auxiliary color correction data is a 10-bit digital value. 
     
     
       25. The method of claim 17, wherein the original color values represent Red, Green, and Blue color levels. 
     
     
       26. The method of claim 17, wherein the output color value is one of Yellow, Cyan, and Magenta color levels.